> You have a good point but software that exists with no one to sell it is more valuable than salesman with nothing to sell.
Never seen that happen. Software that exists with no one to sell it just doesn't get sold.
On the other hand, a salesman with nothing to sell is Bill Gates when he signed on to provide MS DOS for IBM.
In fact, if you look over the history of this industry, success has, with few exceptions, always been sales-first, then development effort.
It's why we prioritise MVP: do the minimum necessary that we can sell, so that the dev effort is not wasted. At it's core, MVP would involve absolutely no development at all.